How to access the handler from the hub

JupyterHub
1

Hello,

I’m trying to generate a dynamic profile list or a form with preset values that come from the url in the spawner.
For example https://myjupyter.com/hub/start?image=all-spark-notebook&cpu_limit=1&mem_limit=1G

I’ve seen some related issues in GH like jupyterhub/2237 and 2036 or kubespawner/189 but I’m struggling making it work. The handler is always None

def get_profile_list(spawner):
  spawner.log.info(f"handler: {spawner.Handler}")

c.KubeSpawner.profile_list = get_profile_list

or

class CustomSpawner(KubeSpawner):
    def options_form(self, spawner):
      self.log.info(f"spawner handler: {spawner.Handler}")
      self.log.info(f"self handler: {self.Handler}")
      self.profile_list = [ ... ]
      return super().options_form

Is there a way to access the handler in those spots after the /hub GET ?

Thank you!